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Blowdown Valve - An optional valve that allows the flushing of dirt and scale during operation.

Operating Condition
Condensate Load  

TD700S Thermodynamic Steam Trap

DRIP, TRACING: The TD700S  Thermodynamic steam trap is commonly used as a drip trap on steam mains and steam supply lines. These traps are used on tracing applications; however, thermostatic traps are normally recommended for this service. Supplied with an integral strainer and optional blow down valve to protect the trap from contamination. The internal working mechanism of the TD700S can be completely replaced while the trap body remains in line. Ideal for outdoor applications that are subject to freezing and for super heated steam conditions.

ModelSizeTypeOptionsMax PMO (psig)Max Capacity @ Max PMO (lb/hr)
TD700S-12-SW1/2"Socket Weld600
TD700S-13-SW3/4"Socket Weld600
TD700S-14-SW1"Socket Weld600
TD700S-12-F1501/2"150# FLG600
TD700S-13-F1503/4"150# FLG600
TD700S-14-F1501"150# FLG600
TD700S-12-F3001/2"300# FLG600
TD700S-13-F3003/4"300# FLG600
TD700S-14-F3001"300# FLG600
TD700S-12-F6001/2"600# FLG600
TD700S-13-F6003/4"600# FLG600
TD700S-14-F6001"600# FLG600
TD700HS-12-SW1/2"Socket WeldHS600
TD700HS-13-SW3/4"Socket WeldHS600
TD700HS-14-SW1"Socket WeldHS600
TD700HS-12-F1501/2"150# FLGHS600
TD700HS-13-F1503/4"150# FLGHS600
TD700HS-14-F1501"150# FLGHS600
TD700HS-12-F3001/2"300# FLGHS600
TD700HS-13-F3003/4"300# FLGHS600
TD700HS-14-F3001"300# FLGHS600
TD700HS-12-F6001/2"600# FLGHS600
TD700HS-13-F6003/4"600# FLGHS600
TD700HS-14-F6001"600# FLGHS600
Product Overview
DRIP, TRACING: TD700S  model steam traps are fully inline repairable and most commonly used in drip applications, such  as draining condensate from steam mains and steam supply lines. They can also be used for steam tracing applications.  These traps are suitable for outdoor applications that are subject to freezing as well as superheated steam conditions. They feature a “Quick-Replace” capsule that contains the trap’s complete  internal working mechanism, which is easily replaced while the trap body remains in-line. All models contain an integral  strainer for protection against dirt and scale.
• “Quick-Replace” capsule design for easy in-line repair
• Integral strainer with optional blowdown valve to protect trap from contamination
• High pressure applications up to 600 PSIG
• Hardened stainless steel seat and disc for extended service life even at high pressure
• Single trap will operate over the entire pressure range 4-600 PSIG (recommended above 30 PSI)
• Suitable for superheated steam
• Freezeproof when trap is piped in a vertical orientation for complete drainage of condensate
• Non-integral seat and chrome-moly body allow for trap to be welded in-line
• Trap will function in any orientation (horizontal preferred)
How It Works
The disc is the only moving part inside a thermodynamic trap.  When steam enters the trap, it creates an internal pressure above the disc that instantly forces the disc to close tightly on the seat,  preventing the steam from escaping. The internal steam pressure (holding the disc and seat shut) eventually drops, and the trap  re-opens. When condensate enters the trap, it pushes the disc upwards, allowing the condensate to freely discharge. If steam is present, the trap instantly shuts.
Selection / Sizing / Capacities

The TD700HS is a high pressure version of the standard TD700S  model. While both the TD700S and TD700HS will operate with  pressures up to 600 PSIG, the TD700HS has a slightly smaller  dicharge orifice and is recommended for system pressures over 300 PSIG because of increased efficiency and performance. The TD700S is available in NPT, socket weld, and flange connections from 1/2” through 1”. Replacement capsules are available,  see Parts & Kits Section.

Select working pressure; follow column down to correct capacity (lbs/hr) block.

Application: 275 lbs/hr at 100 PSIG working inlet pressure
Size/Model:  TD700S, specify pipe size and connections (NPT, SW, FLG)

Notes:   1) Maximum back pressure not to exceed 80% of inlet pressure (measured in absolute pressure) or trap may not close.
  2) For optimum performance, recommended for operating pressure above 30 PSIG.
Dimension and Weights
Blowdown valve, used for flushing dirt and scale from strainer. Customized Flanged Connections:

TD700HS = The high pressure version of the TD700S.
The standard model TD700S will operate over the entire pressure range, however, the TD700HS will operate more efficiently and have a longer service life for pressures over 300 PSIG.

TD700S Standard pressure capsule 4-300 PSIG
TD700HS  High pressure capsule 150-600 PSIG

Option: TD700SB = Blowdown Valve

Installation and Maintenance
The TD700S can be installed in any orientation; however, horizontal with cap facing upward is preferred for longest service life. For maintenance, ALL internal components are easily removed and completely changed using a replacement kit. All models of the TD700S contain an integral strainer for protection against dirt and scale. Available in NPT, Socket-Weld and Flange connections.
Sample Specification
The steam trap shall be a thermodynamic style in a chrome-moly alloy steel body with an integral strainer and optional blowdown valve. Unit shall have an all stainless steel in-line removable seat and disc capsule assembly. Trap shall be capable of installation in any orientation and self-draining when mounted vertically.